tell her to stop being a little virgin and take it like a fuckin' champ.
give her a benzodiazepine and tell her to loosen up
but in all seriousness, either her vag is too fuckin small, or she's just gotta relax a little. if it's the former, there's not much u can do. i've heard of couples not being able to have that much sex cuz the girls cunt is too fuckin tight. lol i duno how they're gonna have kids, cuz a baby's head is way bigger than the head of your cock.